The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2001
Filed:
Aug. 02, 1999
Manfred Ruoff, Moeglingen, DE;
Horst Harndorf, Schwieberdingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A fuel injection system comprising a common rail pressure reservoir filled with fuel at high pressure and having a dual-substance nozzle for dual fluid injection of fuel and a supplementary liquid into an internal combustion engine. The system includes a first 2/2-way valve, in the injection line between the common rail pressure reservoir and a pressure chamber surrounding the nozzle needle of the dual-substance nozzle, and a second 2/2-way valve, whose inlet communicates, via a feed line with the injection line at a point between the first 2/2-way valve and the pressure chamber. An outlet of the pressure chamber communicates with the low-pressure fuel side via a drain line (,). As a result, the otherwise usual, technologically much more complicated 3/2-way magnet valves can be replaced with more economical 2/2-way valves. At the same time, the possibility is afforded of shifting the quantity metering for supplementary liquid to a single metering valve that serves an entire group of fuel injectors.